Rating for poems is a little different that the others, let me show you:

G = good for everyone. Happy. Has a happy ending. Something like that.
PG = This is for poems about love, life, and that kinda stuff. A bit of cursing just stuff like "damn" "hell".
PG-13 = Really dark. About death and that kind of stuff. Cussing al ot of it.
R = Violence, swearing, and sex.

If it's above R it will get you banned!